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'(No Model.)

' E. A. TUTTLE.

HOT AIR FURNACE.

Patented Jan. 20, 1885.

1W0 V E 'I I I ings, in which- UNITED STATES EDWARD A. TUTTLE,

PATENT FFICE.

on NEW YORK, N. Y.

HOT-AIR FURNACE.

SPECIFICATION forming part of Letters Patent No. 311,152, dated January20, 1885. 1

Application filed November 14, W81.

T0 aZZ whom it may concern Be it known that I, EDWARD A. TUr'rLn, acitizen of the United States, residing at New York city, in the countyand State of New York, have invented a new and useful in provement inHot-Air Furnaces, of which the following is a specification.

My invention consists of one or more jackets or inclosures of woven wiresurrounding the body of the furnace inside of the wall that incloses theair-space, preferring a series of said wire jackets, one withinanother,- to intercept the radiant heat of the furnace and heat theair-currents rising up between and passing through them to betteradvantage than can be done by sheet-metal jackets or inclosures, becauseof more equal distribution of the heat, and also because of bettereffect on the air due to its free circulation through the meshes of thewire, and the air-currents have better action, because of not beingconfined in those spaces between the jackets that they may enter at thebottom, but may pass through the jackets from one space to another, andthe air impinges much more effectively on the projections and transversewires of the woven fabric than on the surfaces of metal plates, all ashereinafter fully described, reference being made to the accompanyingdraw- Figure 1 is a sectional elevation of a furnace having a series ofwoven-wire inclosing-jackets surrounding it, and Fig. 2 is a top view ofthe same with the cover of the inclosing-wall removed.

The body of the furnace, a, may be of any approved form or construction,also the inclosing-wall b. In this case I have represented a furnacehaving an oblong base and gradually changing to a round form at the top,which I have surrounded with a series of four wovenwire jackets, c, ofabout the same form in cross-section as that of the furnace, and ofdifferent sizes, enabling them to be located one within the other, asshown. The jackets that are larger than the base of the furnace willrest on the ground; but those of smaller size will be suspended over thetapering sides of the heater, and a little above said sides, as shown atd, to allow free passage of air along up the sides and under the lowerends of the suspended jackets to pass into the interior spaces of theinner jackets.

(No model.)

the furnace, or they may besupported by those larger jackets that rest.on the ground by any suitable connection to them. The air may enter theheating-space through any suitable opening, or by a conductor or conduetors, f, discharging the air under the jackets, to supply them alike,or nearly so, and, if desired, the jackets may extend above the top ofthe furnace.

It may be seen that heat-rays passing through the meshes and interceptedby-the first jacket may be lodged in the next, and others passingthrough two or more jackets may be lodged on the outer ones, and the airwill be measurably divided into separate currents,according to thespaces 6 between the jackets, which will be heated about in theproportion of their distance away from the furnace, so that all ornearly all the heat will be taken up, and none orlbut very little willbe absorbed by the furnace-walls. At the same time the air will passback and forth through the meshes more or less, so as to have contactwith the wires, in addition to that of the directly-rising currents,calculated to have the best effects.

It is to be understood that the essential object of the invention is todivide the space between the shell of the furnace and the wallsinclosing the said space by webs of woven wire arranged parallel to thesaid shell of the furnace and the inclosing-walls, and formingcorresponding annular spaces, in which the air rising between said webswill be effectually heated-some of it by direct action of the lateralheat-rays from the shell of the furnace, and some by contact with thewires, which are heated by some of the heat-rays intercepted by them, itbeing intended to employ a sufficient number of wire webs to interceptall the heat-rays and prevent any from reaching the inclosing-walls bydirect contact; and it is an essential part of the arrangement that theannular and vertical spaces between the wire webs and between them andtheshell of the furnace-and inclosing-walls shall be free and clear, toafibrd as little obstruction as possible to the upward flow of air.

I am aware that coils of sheet-scrap and loose pieces of metal have beenplaced radially and vertically in the air-heating space, to interceptthe heat-rays and become heated for heating the airflowing up along theinterven ing spaces; but such arrangements require much greater quantityof metal, are not as symmetrical, and offer much greater obstruction tothe upward flow of the air than my arrangement, in which the series ofsuccessive webs together completely cover the walls and present acontinuous and effective barrier to all lateral rays of radiant heatwith but little mass of material, and at the same time afford but littleobstruction to the upflow of the air.

I am also aware that wire webs have been i set edgewise radially to thefurnace, together with an annular horizontal web of similar material attop of the radial webs; but these do not cover the walls, and are butslightly effective for intercepting the heat-rays and preventing theheat from being wasted in the walls, and the horizontal webs have butvery little effect upon the air passing through the meshes.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s

1. A hot-air furnace having one or more surrounding jackets or webs ofwoven wire arranged within the wall inclosing the airspace parallel tothe furnace-shell and iuclosing-walls, to intercept the heat rays andheat the air, substantially as described.

2. In ahot-air furnace having a series of surrounding jackets of wovenwire arranged within the inclosing-wall, one or more of said jacketssuspended above the sides of the furnace, with a free space, 01, betweenthe furnace and the lower end or ends of the jacket or jackets, for thefree passage of air under and into the said jacket or jackets,substantially as described.

EDWARD A. TUITLE.

\Vitnesses:

\V. J. MORGAN, S. H. MORGAN.

